MGRE 环境下配置OSPF实验

1.实验要求及其拓扑图：

2.配好IP的拓扑图见下；

3.实验分析

        1.R6为ISP只能配置IP地址,R1—R5的环回为私有网段

                ISP路由器只进行IP配置，因此R1--R5需配置指向ISP路由器的缺省路由

[r1]ip route-static 0.0.0.0 0 16.0.0.2    (r1的缺省)
[r1]ip route-static 0.0.0.0 0 161.0.0.2


[r2]ip route-static 0.0.0.0 0 26.0.0.2    (r2的缺省)


[r3]ip route-static 0.0.0.0 0 36.0.0.2    (r3的缺省)


[r4]ip route-static 0.0.0.0 0 46.0.0.2    (r4的缺省)


[r5]ip route-static 0.0.0.0 0 56.0.0.2    (r5的缺省)

        2.R1/4/5为全连的MGRE结构,R1/2/3为星型的拓扑结构,R1为中心站点 

                r1/r2/r3，其中r1为中心，所以按照配置MGRE步骤来即可，并开启伪广播域

                R1/4/5为全连的MGRE结构，即每个路由器均为中心，需向其他路由汇报自己

        R1:

[r1]int t 0/0/0
[r1-Tunnel0/0/0]ip ad 192.168.6.1 24
[r1-Tunnel0/0/0]tunnel-protocol gre p2mp
[r1-Tunnel0/0/0]source 16.0.0.1
[r1-Tunnel0/0/0]nhrp neteork-id 100
[r1-Tunnel0/0/0]nhrp entry multicast dynamic

[r1]int t 0/0/1
[r1-Tunnel0/0/1]ip ad 192.168.7.1 24
[r1-Tunnel0/0/1]tunnel-protocol gre p2mp
[r1-Tunnel0/0/1]source 161.0.0.1
[r1-Tunnel0/0/1]nhrp neteork-id 101
[r1-Tunnel0/0/1]nhrp entry multicast dynamic
[r1-Tunnel0/0/1]nhrp entry 192.168.7.2 46.0.0.1 register
[r1-Tunnel0/0/1]nhrp entry 192.168.7.3 56.0.0.1 register

        R2;

[r2]int t 0/0/0
[r2-Tunnel0/0/0]ip ad 192.168.6.2 24	
[r2-Tunnel0/0/0]tunnel-protocol gre p2mp	
[r2-Tunnel0/0/0]source GigabitEthernet 0/0/0
Jul 13 2022 16:18:11-08:00 r2 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/0 has entered the UP state. 	
[r2-Tunnel0/0/0]nhrp network-id 100
[r2-Tunnel0/0/0]nhrp entry 192.168.6.1 16.0.0.1 register 

        R3:

[r3]int t 0/0/0
[r3-Tunnel0/0/0]ip ad 192.168.6.3 24
[r3-Tunnel0/0/0]tunnel-protocol gre p2mp	
[r3-Tunnel0/0/0]source GigabitEthernet 0/0/0
Jul 13 2022 16:20:09-08:00 r3 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/0 has entered the UP state. 
[r3-Tunnel0/0/0]nhrp network-id 100
[r3-Tunnel0/0/0]nhrp entry 192.168.6.1 16.0.0.1 register 

        R4:

[r4]int t 0/0/0
[r4-Tunnel0/0/0]ip ad 192.168.7.2 24
[r4-Tunnel0/0/0]tunnel-protocol gre p2mp
[r4-Tunnel0/0/0]source 46.0.0.1
Jul 13 2022 16:25:29-08:00 r4 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/0 has entered the UP state. 
[r4-Tunnel0/0/0]nhrp network-id 101	
[r4-Tunnel0/0/0]nhrp entry multicast d	
[r4-Tunnel0/0/0]nhrp entry 192.168.7.3 56.0.0.1 register 
[r4-Tunnel0/0/0]nhrp entry 192.168.7.1 161.0.0.1 register (其他路由器上上报过的可以省略)
Info: This peer protocol address conflicts with hub register peer protocol addre
ss. 

         R5：

[r5]int t 0/0/0
[r5-Tunnel0/0/0]ip ad 192.168.7.3 24
[r5-Tunnel0/0/0]tunnel-protocol gre p2mp
[r5-Tunnel0/0/0]source 56.0.0.1
Jul 13 2022 16:26:46-08:00 r5 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/0 has entered the UP state. 
[r5-Tunnel0/0/0]nhrp network-id 101
[r5-Tunnel0/0/0]n e m d	

         3.,所有私有网段可以互相通讯,私有网段使用OSPF完成。

                MGRE环境下接口ospf的网络类型需进行修改(如过不修改将无法建立邻接关系)

                R1-R3接口改为p2mp,R1,R4,R5改为boardcast

        R1(R2-R5配置均相似，略):

[r1]ospf 1 router-id 1.1.1.1
[r1-ospf-1]area 0
[r1-ospf-1-area-0.0.0.0]network 192.168.1.0 0.0.0.255
[r1-ospf-1-area-0.0.0.0]network 192.168.6.0 0.0.0.255
[r1-ospf-1-area-0.0.0.0]network 192.168.7.0 0.0.0.255

4.实验结果验证：

MGRE结果：

 网络连通性：